As a limitation the Azure MFA SDKcan only be used for Phone or SMS (one-way, two-way) authentication but not with the mobile app method. That’s because of mobile app uses a Web Service to get messages pushed and this one needs to be implemented with MFA-Server.

But I find it a neat solution to have an authorization task for an approval of group membership with using the mobile app. There are a couple of things needed to get this working: